james n



No Model.

J. N. RIOHBY, s. 'N. 'HENOH & W QA. DROMGOLD.

SAWMILL DOG.

No. 488,906. Patented Deo. 27,1892.

avwewtow arnes 2412:0226

W d'fro cmm 1 UNITED STATES PATENT OFFICE.

JAMES N. RICHEY, OF CARMICHAELS, AND SAMUEL N. I-IENOH AND WALKER A.DROMGOLD, OF YORK, PENNSYLVANIA; SAID RIOHEY SAID I-IENOH AND DROMGOLD.

ASSIGNOR TO SAWMILL-DOG.

SPECIFICATION forming part of Letters Patent No. 488.906, dated December2'7, 1892.

Application filed August 2, 1892. Serial No. 441,926. (No model.)

To aZZ whom it may concern.-

Be it known that we, JAMES N. RIGHEY, of Oarmichaels, Green county, andSAMUEL N. HENOH and W ALKER A. DROMGOLD, of .York,

5 State of Pennsylvania, have invented a certain new and usefulImprovement in Sawmill-Dogs, of which the following is a specification.

This improvement has particular reference IO to means for setting thedog usually carried by the head block into the material to be held byit, and its object is to provide a simple, easily manipulated, efficientand inexpen sive mechanism for the purpose. To this end I 5 we combinewith thehead block, the rack bar thereon, the dog, and the dog carryingslide or bracket, a lever to engage the rack bar, which is pivoted in acarrier hung on a pin or pivot in the dog carrying bracket or slide,

the arrangement being such that while the lever can vibrate on its pivotindependently of its carrier-the carrier may swing upon its own pivotalaxis in such manner as to permit both it and the lever which it carriesto advance toward and recede from the rack bar. It is this combinationwhich characterizes our invention.

To enable others skilled in the art to understand and use our inventionwe will now 0 proceed to describe it by reference to the accompanyingdrawings, in which Figure l is a sectional elevation on line 11, Fig. 2,and Fig. 2 is aside elevation of a head block embodying our improvement.

The head block consists as usual of a knee A held to and adapted toslide back and forth on a base B placed transversely on and se cured tothe carriage Othis movement of the knee being obtained by an adjustingpinion 00 gearing with a rack y on the underside of the horizontal limbof the knee. To one side of the upright limb of the knee is made fastthe vertical rack bar D, upon which is mounted and adapted to slide upand down the dog carrying bracket or slide E. The

dog is shown at F; it is as usual capable of lengthwise adjustment inthe bracket, and is held in its adjusted position therein by suitablemcans, as for example by a spring pin on the carrier which enters theappropriate one of several notches or holes in the dog. We do not showthis fastening device, however, inasmuch as it is well known, and formsno part of our improvement.

G is the lever carrier-in this instance of yoke or reversed U form, hungat its upper end on a pivot pin at having its bearings in ears I) on thecarrier. Between the legs of the yoke is pivoted the lever ll bya crosspin 0 extending between and supported in the legs of the yoke. The shortend of the lever-the end next to the rack bar-has a single tooth dformed by rounding and reducing that end in diameter. And for thepurpose of making provision for the engagement of such a tooth with therack bar, the latter can conveniently have a series of holes 6 formed init at suitable distances apart into which the tooth d can be entered asshown in Fig. l. rack bar may have raised teeth, and the lever on itsinner end may have one or more teeth to engage therewith. But we muchprefer the arrangement illustrated on the score of efficiency,simplicity, and economy. Under this arrangement the lever has a propervibratory movement of. its own independent of its swinging carrier,while both carrier and lever can swing together to and from the rackbar. This arrangement gives a wide and varied range of movement to thelever and permits it to be most efficiently and conveniently used forthe purpose of properly setting and toreing the dog into the material.

In order to hold the dog carrying bracket A in the adjusted position wemake use of a set screw f provided with a handle h, by a very slightmovement of which the bracket can be clamped to or released from therack bar.

The dog carrying bracket is manipulated by taking the set screw handlein one hand and the lever in the other hand. Under these circumstancesthe bracket can be quickly moved up and down, the dog can bequickly setand the bracket after the dog has been set,'can at once be fastened inits adjusted position.

Having described our improvement and the best way known to us ofcarrying the same into effect what we claim herein as new and of our owninvention is as follows:

Manifestly, however, if desired the 7o 1. The combination of the headblock, the rack bar, the vertically movable dog-carrying bracket, theswinging lever-carrier pivoted to the bracket, and the rack-engaginglever pivoted to the carrier, substantially as and for the purposeshereinbefore set forth.

2. The combination with the head block and the vertically movabledog-carrying bracket of the swinging lever-carrier pivoted to thebracket, the lever hung or pivoted in the free end of said carrier, andhaving a single tooth, and the rack bar formed with aseries of holes toreceive said tooth, substantially as and for the purposes hereinheforeset forth.

3. The combination with the head block

